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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 179 · 40 questions
TalentJR

How to do it in your head (Split, then double or halve): To double: split into tens and ones, double both, add. To halve: split into an even number of tens and the rest (156 = 140 + 16). Halve both parts and add.

NameDateTime takenScore ___ / 40
  1. 1.Double 48 =
  2. 2.Half of 122 =
  3. 3.Half of 102 =
  4. 4.Half of 112 =
  5. 5.Double 77 =
  6. 6.Double 28 =
  7. 7.Double 55 =
  8. 8.Double 51 =
  9. 9.Half of 116 =
  10. 10.Double 71 =
  11. 11.Half of 72 =
  12. 12.Half of 196 =
  13. 13.Double 25 =
  14. 14.Double 92 =
  15. 15.Double 88 =
  16. 16.Half of 104 =
  17. 17.Double 78 =
  18. 18.Half of 62 =
  19. 19.Half of 74 =
  20. 20.Half of 170 =
  21. 21.Half of 54 =
  22. 22.Double 21 =
  23. 23.Double 35 =
  24. 24.Double 89 =
  25. 25.Half of 38 =
  26. 26.Double 75 =
  27. 27.Double 98 =
  28. 28.Double 68 =
  29. 29.Double 27 =
  30. 30.Half of 180 =
  31. 31.Double 54 =
  32. 32.Half of 46 =
  33. 33.Half of 70 =
  34. 34.Double 45 =
  35. 35.Double 29 =
  36. 36.Half of 52 =
  37. 37.Double 73 =
  38. 38.Double 61 =
  39. 39.Half of 42 =
  40. 40.Double 56 =

Answer key

  1. 96
  2. 61
  3. 51
  4. 56
  5. 154
  6. 56
  7. 110
  8. 102
  9. 58
  10. 142
  11. 36
  12. 98
  13. 50
  14. 184
  15. 176
  16. 52
  17. 156
  18. 31
  19. 37
  20. 85
  21. 27
  22. 42
  23. 70
  24. 178
  25. 19
  26. 150
  27. 196
  28. 136
  29. 54
  30. 90
  31. 108
  32. 23
  33. 35
  34. 90
  35. 58
  36. 26
  37. 146
  38. 122
  39. 21
  40. 112

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